thread_linux_sparc.hpp revision 196:d1605aabd0a1 
1/*
2 * Copyright 1998-2008 Sun Microsystems, Inc.  All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25private:
26
27  void pd_initialize() {
28    _anchor.clear();
29    _base_of_stack_pointer        = NULL;
30  }
31
32  frame pd_last_frame() {
33    assert(has_last_Java_frame(), "must have last_Java_sp() when suspended");
34    assert(_anchor.walkable(), "thread has not dumped its register windows yet");
35
36    assert(_anchor.last_Java_pc() != NULL, "Ack no pc!");
37    return frame(last_Java_sp(), frame::unpatchable, _anchor.last_Java_pc());
38  }
39
40  // Sometimes the trap handler needs to record both PC and NPC.
41  // This is a SPARC-specific companion to Thread::set_saved_exception_pc.
42  address _saved_exception_npc;
43
44  // In polling_page_safepoint_handler_blob(s) we have to tail call other
45  // blobs without blowing any registers.  A tail call requires some
46  // register to jump with and we can't blow any registers, so it must
47  // be restored in the delay slot.  'restore' cannot be used as it
48  // will chop the heads off of 64-bit %o registers in the 32-bit
49  // build.  Instead we reload the registers using G2_thread and this
50  // location.  Must be 64bits in the 32-bit LION build.
51  jdouble _o_reg_temps[6];
52
53  // a stack pointer older than any java frame stack pointer.  It is
54  // used to validate stack pointers in frame::next_younger_sp (it
55  // provides the upper bound in the range check).  This is necessary
56  // on Solaris/SPARC since the ucontext passed to a signal handler is
57  // sometimes corrupt and we need a way to check the extracted sp.
58  intptr_t* _base_of_stack_pointer;
59
60public:
61
62  static int o_reg_temps_offset_in_bytes() { return offset_of(JavaThread, _o_reg_temps); }
63
64#ifndef _LP64
65  address o_reg_temps(int i) { return (address)&_o_reg_temps[i]; }
66#endif
67
68  static int saved_exception_npc_offset_in_bytes() { return offset_of(JavaThread,_saved_exception_npc); }
69
70  address  saved_exception_npc()             { return _saved_exception_npc; }
71  void set_saved_exception_npc(address a)    { _saved_exception_npc = a; }
72
73
74public:
75
76  intptr_t* base_of_stack_pointer() { return _base_of_stack_pointer; }
77
78  void set_base_of_stack_pointer(intptr_t* base_sp) {
79    _base_of_stack_pointer = base_sp;
80  }
81
82  void record_base_of_stack_pointer() {
83    intptr_t *sp = (intptr_t *)(((intptr_t)StubRoutines::Sparc::flush_callers_register_windows_func()()));
84    intptr_t *ysp;
85    while((ysp = (intptr_t*)sp[FP->sp_offset_in_saved_window()]) != NULL) {
86      sp = (intptr_t *)((intptr_t)ysp + STACK_BIAS);
87    }
88    _base_of_stack_pointer = sp;
89  }
90
91  bool pd_get_top_frame_for_signal_handler(frame* fr_addr, void* ucontext,
92    bool isInJava);
93
94  // These routines are only used on cpu architectures that
95  // have separate register stacks (Itanium).
96  static bool register_stack_overflow() { return false; }
97  static void enable_register_stack_guard() {}
98  static void disable_register_stack_guard() {}
99